Exhibit 21



SUBSIDIARIES OF

POTASH CORPORATION
OF SASKATCHEWAN INC.





|                                              |  |                                           
|--------------------------------------------- |  | ------------------------------------------
|Name of Entity                                |  | Jurisdiction of Incorporation or Formation
|101070338 Saskatchewan Ltd.                   |  | Saskatchewan                              
|175360 Canada Inc.                            |  | Canada                                    
|628550 Saskatchewan Ltd.                      |  | Saskatchewan                              
|4420 Investment LLC                           |  | Delaware                                  
|AA Sulfuric Corporation                       |  | Louisiana                                 
|Canpotex Bulk Terminals Limited               |  | Canada                                    
|Chilkap Resources Ltd.                        |  | Yukon                                     
|Inversiones El Boldo Limitada                 |  | Chile                                     
|Inversiones El Coigüe S.A.                    |  | Chile                                     
|Inversiones El Roble S.A.                     |  | Chile                                     
|Inversiones El Sauce S.A.                     |  | Chile                                     
|Inversiones PCS Chile Limitada                |  | Chile                                     
|Inversiones RAC Chile S.A.                    |  | Chile                                     
|Minera Saskatchewan Limitada                  |  | Chile                                     
|PCS Administration (USA), Inc.                |  | Delaware                                  
|PCS (Barbados) Holdings SRL                   |  | Barbados                                  
|PCS (Barbados) Investment Company Ltd.        |  | Barbados                                  
|PCS (Barbados) Shipping, Ltd.                 |  | Barbados                                  
|PCS Cassidy Lake Company                      |  | Ontario                                   
|PCS Cassidy Lake Limited                      |  | Canada                                    
|PCS Chile I LLC                               |  | Delaware                                  
|PCS Chile II LLC                              |  | Delaware                                  
|PCS Fosfatos do Brasil Ltda.                  |  | Brazil                                    
|PCS Hammond LLC                               |  | Delaware                                  
|PCS Hungary Holding Limited Liability Company |  | Hungary                                   
|PCS Industrial Products Inc.                  |  | Delaware                                  
|PCS Joint Venture, Ltd.                       |  | Florida                                   
|PCS Jordan LLC                                |  | Delaware                                  
|PCS L.P. Inc.                                 |  | Delaware                                  
|PCS LP LLC 2                                  |  | Delaware                                  
|PCS Nitrogen Ammonia Terminal Corporation I   |  | Texas                                     
|PCS Nitrogen Ammonia Terminal Corporation II  |  | Delaware                                  
|PCS Nitrogen Delaware LLC                     |  | Delaware                                  
|PCS Nitrogen Fertilizer, L.P.                 |  | Delaware                                  
|PCS Nitrogen Fertilizer Operations, Inc.      |  | Delaware                                  
|PCS Nitrogen, Inc.                            |  | Delaware                                  
|PCS Nitrogen LCD Corporation                  |  | Delaware                                  
|PCS Nitrogen Ohio, L.P.                       |  | Delaware                                  
|PCS Nitrogen Trinidad Corporation             |  | Delaware                                  
|PCS Nitrogen Trinidad Limited                 |  | Trinidad                                  
|PCS Phosphate Company, Inc.                   |  | Delaware                                  
|PCS Purified Phosphates                       |  | Virginia                                  
|PCS Sales (Canada) Inc.                       |  | Saskatchewan                              
|PCS Sales (Indiana), Inc.                     |  | Indiana                                   
|PCS Sales (Iowa), Inc.                        |  | Iowa                                      
|PCS Sales (USA), Inc.                         |  | Delaware                                  
|PCS USA LLC                                   |  | Delaware                                  



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|                                                     |  |             
|---------------------------------------------------- |  | ------------
|Pérola S.A.                                          |  | Brazil      
|Phosphate Holding Company, Inc.                      |  | Delaware    
|Potash Corporation of Saskatchewan (Florida) Inc.    |  | Florida     
|Potash Corporation of Saskatchewan Transport Limited |  | Saskatchewan
|PotashCorp Agricultural Cooperative Society Ltd.     |  | Israel      
|PotashCorp Finance (Barbados) Limited                |  | Barbados    
|PotashCorp (Luxembourg) Finance S.à r.l.             |  | Luxembourg  
|Potash Holding Company, Inc.                         |  | Delaware    
|RAC Investments Ltd.                                 |  | Cayman      
|White Springs Agricultural Chemicals, Inc.           |  | Delaware